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Crossfire on Abit IP35 Pro? (1 PCI-e x16 & 1 PCI-e x4)

post #1 of 12
Thread Starter 
Yeah, so from the topic, I have an Abit IP35 pro, http://www.newegg.com/Product/Produc...82E16813127030. Would I be able to run crossfire with this board, or would it give decreased results? For PCI-E slots it lists 1 x PCI-E X16, 1 x PCI-E X16 (x4 bandwidth)
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post #2 of 12
You will be ok with the 1950xt in Crossfire.
Anything higher..like 2900, 3870s, 3870x2s will see a performance difference in crossfire in the p35board vs x38/x48 boards.
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post #3 of 12
Thread Starter 
oh, should of posted in my original, I was looking at doing crossfire for the 4850's
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post #4 of 12
It will work just fine however you'll probably have a 3-5% performance drop from the lesser bandwidth
post #5 of 12
I would get a new board like the X38 or X48. Test have shown that PCI-E 1.X x16 bottlenecks (not huge but it is there) these cards in crossfire so the x4 slot will be severely bottlenecking it.
http://www.tweaktown.com/articles/14...ion/index.html
That article is comparing PCI-E 2.0 8x (= to PCI-E 1.x 16x) to PCI-E 2.0 16x (= 2x PCI-E 1.x 16x)
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post #6 of 12
Quote:
Originally Posted by Penicilyn View Post
It will work just fine however you'll probably have a 3-5% performance drop from the lesser bandwidth
A lot more than 5% performance drop. Depending on resolution, he could lose 75% performance.
post #7 of 12
Thread Starter 
ouch, that sorta defeats the purpose of crossfire then i guess. Never really thought it'd be much of an issue when buying the board. Pretty much figured, if its 2 pci-e x16 slots, it'd be good. Why the hell isnt it just called pci-e x4 then? heh
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post #8 of 12
Quote:
Originally Posted by Emraith View Post
ouch, that sorta defeats the purpose of crossfire then i guess. Never really thought it'd be much of an issue when buying the board. Pretty much figured, if its 2 pci-e x16 slots, it'd be good. Why the hell isnt it just called pci-e x4 then? heh
Because it is physically 16 lanes. You can pick up a DFI DK X38 for 180 on the egg.
post #9 of 12
the board clearly states that 1 lane at x16, and other one if in crossfire does x4.

Some people buy the board for overclocking or using two video cards in non-crossfire for quad monitors.
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post #10 of 12
Quote:
Originally Posted by crazcookye View Post
the board clearly states that 1 lane at x16, and other one if in crossfire does x4.

Some people buy the board for overclocking or using two video cards in non-crossfire for quad monitors.
CF supports multiple monitors, SLI doesn't. There would be no reason to have the two cards separate.
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